Vacuum-pump rotor

Abstract

A vacuum-pump rotor, in particular a vacuum-pump rotor for a turbomolecular pump, having a hub element for connecting to a rotor shaft or for forming a rotor shaft. A plurality of rotor blades are connected to the hub element. In order to form a vacuum-pump rotor by means of which a high tip speed can be achieved, the hub element and/or the rotor blades are produced of a plurality of material layers.

The invention claimed is: 
     
       1. A vacuum-pump rotor comprising:
 a hub element for connecting to a rotor shaft and/or for forming a rotor shaft, wherein the hub element comprises a holding element comprising fiber-reinforced material, 
 a plurality of rotor blades radially extending from the hub element at a blade foot, and 
 a stiffening element of a fiber-reinforced material, said stiffening element being connected to the holding element by face-to-face contact and extending into the blade foot, 
 wherein the hub element and/or the rotor blades comprise a plurality of material layers. 
 
     
     
       2. The vacuum-pump rotor according to  claim 1 , wherein at least one of the material layers comprises fiber-reinforced material. 
     
     
       3. The vacuum-pump rotor according to  claim 1 , wherein the plurality of rotor blades surround the hub element, each of rotor blade of said plurality of rotor blades comprising the blade foot connected to the hub element and a blade head connected to the blade foot. 
     
     
       4. The vacuum-pump rotor according to  claim 1 , further comprising a base element comprising fiber-reinforced material said base element being directly or indirectly connected to the holding element. 
     
     
       5. The vacuum-pump rotor according to  claim 4 , wherein the base element comprises a hub member arranged in the hub element and forms the blade foot. 
     
     
       6. The vacuum-pump rotor according to  claim 1 , wherein the hub element comprises two mutually opposite holding elements having arranged between them a hub member of the base element. 
     
     
       7. The vacuum-pump rotor according to  claim 1 , wherein the stiffening element comprises, on an inner side, a fixing element extending at least partially axially and/or engaging behind the holding element. 
     
     
       8. The vacuum-pump rotor according to  claim 1 , wherein two mutually opposite stiffening elements are arranged on different sides of the base element. 
     
     
       9. The vacuum-pump rotor according to  claim 1 , wherein at least one additional blade element is provided which comprises fiber-reinforced material, said additional blade element being connected to the holding element and extending into the blade foot and into the blade head. 
     
     
       10. The vacuum-pump rotor according to  claim 9 , wherein the at least one additional blade element comprises, on an inner side, a fixing element extending at least partially axially and/or engaging behind the holding element. 
     
     
       11. The vacuum-pump rotor according to  claim 9 , wherein one of the additional blade elements comprises a radial layer of fiber-reinforced material. 
     
     
       12. The vacuum-pump rotor according to  claim 11 , wherein at least one of the additional blade elements is an inner additional blade element connected to a blade head of the base element by face-to-face contact. 
     
     
       13. The vacuum-pump rotor according to  claim 12 , wherein, in the area of the blade foot and/or the blade head, the inner additional blade element is in direct abutment on the outer additional blade element by face-to-face contact. 
     
     
       14. The vacuum-pump rotor according to  claim 9 , wherein one of the additional blade elements comprises a spread tow fabric layer. 
     
     
       15. The vacuum-pump rotor according to  claim 14 , wherein at least one of the additional blade elements is designed as an outer additional blade element connected to the inner additional blade element by face-to-face contact. 
     
     
       16. The vacuum-pump rotor according to  claim 1 , wherein the base element and at least one additional blade element has substantially the same outer contour. 
     
     
       17. The vacuum-pump rotor according to  claim 1 , wherein, in the area of the blade foot, the stiffening element is in direct face-to-face abutment on the base element and/or one of the additional blade elements. 
     
     
       18. The vacuum-pump rotor according to  claim 1 , wherein the rotor is symmetrical multi-layered relative to the base element.